mirror of
https://github.com/johnkerl/miller.git
synced 2026-07-22 15:37:59 +00:00
100 lines
3.4 KiB
C
100 lines
3.4 KiB
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include "lib/mlrutil.h"
|
|
#include "containers/sllv.h"
|
|
#include "containers/slls.h"
|
|
#include "containers/lhmslv.h"
|
|
#include "containers/mixutil.h"
|
|
#include "mapping/mappers.h"
|
|
|
|
typedef struct _mapper_group_like_state_t {
|
|
// map from list of string to list of record
|
|
lhmslv_t* precords_by_key_field_names;
|
|
} mapper_group_like_state_t;
|
|
|
|
static void mapper_group_like_usage(FILE* o, char* argv0, char* verb);
|
|
static mapper_t* mapper_group_like_parse_cli(int* pargi, int argc, char** argv,
|
|
cli_reader_opts_t* _, cli_writer_opts_t* __);
|
|
static mapper_t* mapper_group_like_alloc();
|
|
static void mapper_group_like_free(mapper_t* pmapper, context_t* _);
|
|
static sllv_t* mapper_group_like_process(lrec_t* pinrec, context_t* pctx, void* pvstate);
|
|
|
|
// ----------------------------------------------------------------
|
|
mapper_setup_t mapper_group_like_setup = {
|
|
.verb = "group-like",
|
|
.pusage_func = mapper_group_like_usage,
|
|
.pparse_func = mapper_group_like_parse_cli,
|
|
.ignores_input = FALSE,
|
|
};
|
|
|
|
// ----------------------------------------------------------------
|
|
static void mapper_group_like_usage(FILE* o, char* argv0, char* verb) {
|
|
fprintf(o, "Usage: %s %s\n", argv0, verb);
|
|
fprintf(o, "Outputs records in batches having identical field names.\n");
|
|
}
|
|
|
|
static mapper_t* mapper_group_like_parse_cli(int* pargi, int argc, char** argv,
|
|
cli_reader_opts_t* _, cli_writer_opts_t* __)
|
|
{
|
|
if ((argc - *pargi) < 1) {
|
|
mapper_group_like_usage(stderr, argv[0], argv[*pargi]);
|
|
return NULL;
|
|
}
|
|
mapper_t* pmapper = mapper_group_like_alloc();
|
|
*pargi += 1;
|
|
return pmapper;
|
|
}
|
|
|
|
// ----------------------------------------------------------------
|
|
static mapper_t* mapper_group_like_alloc() {
|
|
mapper_t* pmapper = mlr_malloc_or_die(sizeof(mapper_t));
|
|
|
|
mapper_group_like_state_t* pstate = mlr_malloc_or_die(sizeof(mapper_group_like_state_t));
|
|
pstate->precords_by_key_field_names = lhmslv_alloc();
|
|
|
|
pmapper->pvstate = pstate;
|
|
pmapper->pprocess_func = mapper_group_like_process;
|
|
pmapper->pfree_func = mapper_group_like_free;
|
|
|
|
return pmapper;
|
|
}
|
|
|
|
static void mapper_group_like_free(mapper_t* pmapper, context_t* _) {
|
|
mapper_group_like_state_t* pstate = pmapper->pvstate;
|
|
// lhmslv_free will free the hashmap keys; we need to free the void-star hashmap values.
|
|
for (lhmslve_t* pa = pstate->precords_by_key_field_names->phead; pa != NULL; pa = pa->pnext) {
|
|
sllv_t* plist = pa->pvvalue;
|
|
sllv_free(plist);
|
|
}
|
|
lhmslv_free(pstate->precords_by_key_field_names);
|
|
free(pstate);
|
|
free(pmapper);
|
|
}
|
|
|
|
// ----------------------------------------------------------------
|
|
static sllv_t* mapper_group_like_process(lrec_t* pinrec, context_t* pctx, void* pvstate) {
|
|
mapper_group_like_state_t* pstate = pvstate;
|
|
if (pinrec != NULL) {
|
|
slls_t* pkey_field_names = mlr_reference_keys_from_record(pinrec);
|
|
sllv_t* plist = lhmslv_get(pstate->precords_by_key_field_names, pkey_field_names);
|
|
if (plist == NULL) {
|
|
plist = sllv_alloc();
|
|
sllv_append(plist, pinrec);
|
|
lhmslv_put(pstate->precords_by_key_field_names, slls_copy(pkey_field_names), plist,
|
|
FREE_ENTRY_KEY);
|
|
} else {
|
|
sllv_append(plist, pinrec);
|
|
}
|
|
slls_free(pkey_field_names);
|
|
return NULL;
|
|
} else {
|
|
sllv_t* poutput = sllv_alloc();
|
|
for (lhmslve_t* pe = pstate->precords_by_key_field_names->phead; pe != NULL; pe = pe->pnext) {
|
|
sllv_t* plist = pe->pvvalue;
|
|
sllv_transfer(poutput, plist);
|
|
}
|
|
sllv_append(poutput, NULL);
|
|
return poutput;
|
|
}
|
|
}
|